Spring loaded end port rotary pump



Sept. 21, 1965 E. E. COOK ETAL SPRING LOADED END PORT ROTARY PUMP 2Sheets-Sheet 1 Filed Jan. 10, 1963 INVENTORS [RN/5S7 E. COOK B HARRY J.JADLER MPW 47-well):

Sept. 21, 1965 E. E. COOK ETAL SPRING LOADED END PORT ROTARY PUMP 2Sheets-Sheet 2 Filed Jan. 10, 1965 INVENTORS ERNEST E COOK HARRY J. JADL[1? BY 9 Arron/Ev:

lfl/O if 1. 1|5||| V United States Patent 3,207,079 SPRING LOADED ENDPORT ROTARY PUMP Ernest E. Cook, Anoka, and Harry J. Sadler,Minneapolis, Minn., assignors, by mesne assignments, to Hypro, Inc.,Minneapolis, Minn., a corporation of Ohio Filed Jan. 10, 1963, Ser. No.250,670 1 Claim. (Cl. 103-136) This invention relates generally to arotary pump, and pertains more particularly to a pump provided with arotor having a plurality of grooves or recesses for the accommodation ofa number of centrifugally actuated impeller rollers that provide thepumping action as they traverse a curvilinear path within a pumpingchamber having a varying radius.

One general object of the invention is to provide a rotary pump having alarge volumetric capacity for the physical size of the pump. Also, apump constructed in accordance with the teachings of the presentinvention has a high efiiciency, thereby requiring a relatively smallmotor for driving the pump. It is also an aim of the invention toprovide a rotary pump construction that lends itself readily to a doubleport design to enhance further its capacity for a given size.

Another object of the invention is to provide a rotary pump that can bemanufactured at a comparatively low cost. More specifically, theinvention envisages the use of a structure in which endwise tolerancesare relatively unimportant.

Another object of the invention, which follows from the precedingobject, is to provide an automatic relieving action should the pressurewithin the pumping chamber build up to too high a value. Accordingly,the invention contemplates a spring loaded take-up plate that is urgedin the direction of one end of the rotor. 7

Still another object of the invention is to provide a pump having ahousing or body that is jointless in the region of the pumping chamber,thereby obviating the likelihood of leakage.

Yet another object of the invention is to provide a rotary pump that canbe used satisfactorily with smallmouthed containers. In this regard, thepump of the instant invention can be either inserted into the containeritself or can have a tube depending downwardly into the container whenthe pump is mounted exteriorly. In this latter situation, provision ismade for a check valve to prevent reverse flow or loss of suction whenthe pump is not operating, the check valve that is planned occupying butvery little space.

These and other objects and advantages of the invention will more fullyappear from the following description, made in connection with theaccompanying drawings, wherein like reference characters refer to thesame or similar parts throughout the several views and in which:

FIGURE 1 is a side elevational view of one form my pump can assume, thepump being pictured exteriorly of a small-mouthed container;

FIGURE 2 is a vertical sectional view of the pump of FIGURE 1 in orderto show its internal construction;

FIGURE 3 is a sectional view taken in the direction of line 33 of FIGURE2 for the purpose of showing one end plate that is integral with thepump body and the ports that are disposed therein;

FIGURE 4 is a sectional view through the pumping chamber and the rotordisposed therein, the view being taken in the direction of line 4-4 ofFIGURE 2;

FIGURE 5 is a sectional view in the direction of line 55 of FIGURE 2 forthe purpose of showing the lower end plate and the ports containedtherein, this particular end plate being slidably urged upwardly towardthe lower end of the rotor;

'ice

FIGURE 6 is a top plan view of the cup-shaped member providing the endplate depicted in FIGURE 5;

FIGURE 7 is a side elevational view of the cup-shaped member shown inFIGURE 6;

FIGURE 8 is a vertical longitudinal view in section illustrating asomewhat modified type of pump; and

FIGURE 9 is a bottom end view of the embodiment shown in FIGURE 8.

Referring now to FIGURES 1 and 2, especially the latter figure, it willbe observed that the double ported pump there shown has been designatedgenerally by the reference numeral 10. The pump 10 includes a bodymolded from a suitable plastic material, such as nylon. As best seenfrom an inspection of FIGURE 4, the body has an oval pumping chamber 14formed with an imperforate sidewall. More precisely, the pumping chamber14 is composed of two semicircular walls at each end separated byrelatively narrow parallel walls, these walls producing theabove-mentioned oval shape. Inasmuch as this chamber configurationappears in FIGURE 4, further description is believed unnecessary.However, it is important to note that the body 12 additionally includesan integral end plate 16 formed with a tubular boss or sleeve 18 whichserves as a bearing means as will be better understood from the ensuingdescription. The integral end plate 16 is formed with outer arcuateports 20a, 20b. An arcuate strip 21a and a similar strip 21b separatethe ports 20a, 20b from inner arcuate ports 22a, 22b. As will beunderstood from an examination of FIGURE 3, these ports 20a, 20b and22a, 22b are disposed in a diametrical relationship with each other.

Continuing with the description of the body 12, a discharge chamber 24is provided immediately above the integral end plate 16, there beingoutward communication from the chamber 24 via a discharge spout 26. Fora purpose hereinafter made manifest, a counterbore 28 is provided at theupper end of the body 12 forming a shoulder at 30. In a similar fashion,a lower counterbore 32 is provided and forms a shoulder 34. Thecounterbores 28, 32 thus form cylindrical skirt portions.

A cup-shaped member denoted generally by the reference numeral 36includes a relatively large sleeve portion 38 that is slidably receivedin the skirt portion forming the counterbore 32. At the upper end of thecup-shaped member 36 is a second end plate 40 having upwardly projectinglobes or keys 42 (FIGURE 6) which fit or extend into the lower end ofthe oval pumping chamber 14. The function of the lobes 42 is to preventthe cupshaped member 36 from becoming twisted or angularly misalignedduring the operation of the pump. The member 36 additionally includes asmaller sleeve portion 44 -which functions as a bearing means as willhereinafter be explained. It is important to note, though, that outerarcuate ports 46a, 46b are formed in the plate 40, these arcuate portsbeing boundaried by arcuate strips 47a, 47b which reside intermediatethe ports 46a, 46b and additional ports 48a, 48b which are disposedradially inwardly from the ports 46a, 46b. Here again, the ports 46a,46b and 48a, 48b are arranged diametrically with respect to each other.By comparing FIGURES 3 and 5, it will be additionally noted that theports just referred to are quadrantly oriented with respect to theearlier-mentioned ports 20a, 20b and 22a, 22b. Through the agency of thelobes 42, which prevent the cup-shaped member 36 from turning within thecounterbore 32, the lower ports can be retained in a proper angularrelationship with the upper ports.

At this time, attention is drawn to the presence of a rotor indicated bythe numeral 50. This rotor is shown in FIGURE 4 as being of cylindricalconfiguration, the rotor having a diameter corresponding to the distancebe tween the flat or parallel sides of the imperforate sidewalls. Aswith the pump body 12, the rotor may be molded from a suitable plasticmaterial, such as the previously-mentioned nylon. The rotor has a lengthsubstantially equalling the length of the pumping chamber 14 in which itis disposed. Although the number is susceptible to variation, it will beobserved that the rotor 50 in the present instance is formed with eightlongitudinal grooves or recesses 52, each having parallel sides andextending the full length of the rotor. A shaft 54 extends through therotor 50, and to assure retention of the shaft within the rotor, atcentral or intermediate portion thereof can be serrated or knurled, asindicated at 56 in FIGURE 2.

It will be appreciated that the oval pumping chamber 14 is boundaried atits upper end by the integral end plate 16 and at its lower end by theend plate 40. The end plate 40, owing to the slidable reception of thecup-shaped member 36 within the counterbore 32, is movable relative tothe lower end of the rotor 50. However, it is contemplated that the endplate 40 be urged upwardly in the direction of the rotor 50, and tofulfill this purpose a coil spring 58 has its upper end positioned so asto bear against the lower side or face of the end plate 40. The otherend of the coil spring reactively bears against a spider 60 having a rim62, spokes 64, and a tubular hub 66. A reducer 68 comprised of acylindrical flange 70 has a shoulder 72. Centrally located at the lowerend of the reducer 68 is a nipple 74. Within the confines of the reducer68 is an internal shoulder 76. The shoulder 76 supports an annular seatelement 78. Between the rim 62 of the spider 60 and the annular seat 78is interposed a check valve 80 in the form of a disc of flexiblematerial having a flap portion 82 which is readily deflectable upwardlywhen there is a flow of liquid in an upward direction. The deflectedposition of the flap portion 82 is shown in dotted outline, and it isapparent that this deflected position readily permits the movement ofliquid upwardly but prevents any reverse flow that might otherwise occurthrough the reducer 78.

It has been previously mentioned that the pump body 12 is formed with acounterbore at 28. The purpose of this counterbore is to accommodate orreceive a tube 84 having a vent or opening at 86. A resilient seal 88 islocated at the lower end of the tube 84 and circumscribes the rotorshaft 54. The seal 88 is held in place by a seal retainer 90. Containedwithin the tube 84 is a coupling 92 that mechanically connects the upperend of the shaft 54 to the lower end of a shaft 94 depending downwardlyfrom an electric motor 96. The electric motor is mounted on a fixedbracket 98. In the embodiment that has been denoted in its entirety bythe reference numeral 10, it is planned that the motor 86 be located sothat the pump is immediately above a small-mouthed bottle 100.Therefore, a vertical intake tube 102 is provided which extendsdownwardly into the bottle 100 and it may be assumed that the bottlecontains a liquid 104 such as would be used in making a beverage.

Having presented the foregoing information, a brief operational sequencewill now be presented. Assuming that the rotor 50 is rotating in thedirection of the arrow 106 shown in FIGURE 4, this being a clockwisedirection as viewed in this particular figure and also as viewed whenlooking upwardly in FIGURE 2, the particular cylindrical roller 57 atthe twelve oclock position in FIGURE 4 will be bearing against theimperforate sidewall of the chamber 14 and will also be in closeproximity with the base of the recess 52 in which this particular roller57 is located. Concentrating on the curvilinear path traversed by theparticular roller 57 that we have referred to, it follows that as thisroller is moved in the direction of the arrow 106 toward the threeoclock position, it is at the same time moved outwardly by reason of thecentrifugal force that is developed due to the rotative speed of therotor 50. As the roller 57, that is, the one with which we are presentlyconcerned, moves outwardly, this particular roller provides a spacebetween it and the base of the groove in which it is disposed. Also, asit progresses in a clockwise direction, a lunate space develops behindthis roller. From this information, it will be appreciated that a lowerpressure is produced so as to draw liquid up through the ports 46a and46b of the lower end plate 40. More specifically, the space between thebase of the groove or recess 52 in which the roller 57 now underdiscussion resides is instrumental in causing flow of liquid upwardlythrough the arcuate port 48a, whereas the lun ate space is responsiblefor drawing liquid up through the arcuate port 46a. This actioncontinues until the particular roller 57 that we are referring to passesbeyond the ends of these two ports 46a, 48a. From then on, the liquidthat has been drawn upwardly into the alluded to spaces is forcedupwardly through the ports 20a, 22a of the upper end plate 16 which isintegral with the body 12, as previously explained. Because the liquidis forced outwardly through the ports 20a, 22a, the liquid from thecontainer or bottle is pumped therefrom and traverses a route indicatedby the arrows 108.

Because of the above operational description, it is believed readilyunderstood that the particular roller 57 that is shown in the six oclockposition of FIGURE 4, owing to the double ported construction, does thesame thing as the roller starting from the twelve oclock position.However, the roller starting from the six oclock position acts inconjunction with the ports 46b, 48b, 20b and 22b. Stated somewhatdifferently, the ports 46a, 46b, 48a and 48b serve as inlet ports,whereas the ports 20a, 20b, 22a and 22b function as discharge ports inthe disclosed double ported pump.

It will be discerned that the flap portion 82 of the check valve 80 isreadily deflected into the dotted line position shown in FIGURE 2 topermit the passage of liquid upwardly in the direction of the arrows108. This flap portion 82 quickly returns to a seating position withrespect to the annular seat 78 whenever the pump is stopped. Hence, theliquid that would remain in the pumping chamber 14 cannot escapedownwardly into the container or bottle 100. Hence, the pump 10 willalways be in immediate readiness for any subsequent operation thereof.

Should the pressure in the pumping chamber 14 build up excessively, thenthe end plate 40 will be forced downwardly against the biasing action ofthe coil spring 58 to relieve the pressure. In other words, thecup-shaped member 36, more specifically, its plate 40, acts as a reliefvalve should circumstances so require. Such an arrangement alsominimizes the need for close endwise tolerances between the rotor 50 andthe end plate 40, for the plate 40 will simply adjust to the properposition against the lower end of the rotor 50.

Whereas the pump 10 is intended for use exteriorly of the small-mouthedbottle 100, the embodiment depicted in FIGURE 8 is intended forsubmersion into the liquid to be pumped. This pump 110 is generallysimilar to the earlier-described embodiment 10 but differs somewhat byreason of the lower end thereof.

Instead of the reducer 68, there is employed in the modification ofFIGURE 8 a retainer 112 having a plurality of spaced supporting feet 114which can rest directly against the bottom of the bottle 100, afragmentary portion of the bottom of this bottle appearing in FIG- URE8. The retainer 112 has a series of angularly spaced apertures 116 sothat the liquid taken in between the supportingfeet 114 can flowupwardly in the direction of the arrows 118. The same type of spring isemployed in this situation and it will be noted that the lower end ofthe spring 58 bears against a centering boss 120. Thus, the coil springin the embodiment of FIGURE 8 is held captive by virtue of the retainer112, the spring bearing against the centering boss 118 thereof at thelower end and against the spider 60 at its upper end.

The operation is identical to that which takes place when using the pump10. The liquid is drawn upwardly, as already indicated, in the directionof the arrows 118 and passes through the pumping chamber 14 and out thedischarge spout 26 by the action imparted to the liquid by the rotor 50.

It will, of course, be understood that various changes may be made inthe form, details, arrangements, and proportions of the parts withoutdeparting from the scope of my invention as set forth in the appendedclaim.

What is claimed:

A rotary pump comprising:

(a) a body forming an elongated pumping chamber therewithin providedwith an imperforate sidewall and an integral plate at one end of saidchamber having a port for the passage of fluid therethrough;

(b) a second plate received within said body at the other end of saidchamber having a port displaced angularly from said first port;

(c) a rotor within said pumping chamber journaled for rotation about anaxis nearer said sidewall at one angular location than at another,

(d) said rotor having a plurality of radially directed recessesextending from one end thereof to the other; and

(e) an elongated piston member freely disposed in each of said recesses,

(f) whereby when said rotor is rotated about its said axis the ends ofsaid pistons will successively pass said ports to cause fluid to bedrawn into said pumping chamber via one of said ports and to be forcedoutwardly via said other port;

(g) a resilient member for urging said second plate against the end ofthe rotor adjacent thereto;

(h) said resilient member constituting a coil spring;

(i) a spider member fixedly disposed with respect to said body,

(j) the ends of said coil spring bearing against said second plate andsaid spider member;

(k) the port of said first plate acting as a discharge port and the portof said second plate acts as an inlet port,

(l) a check valve adjacent the opposite side of said spider member fromsaid spring;

(m) said check valve constituting a layer of resilient material having adeflectable flap portion, and (n) an annular element serving as a seatfor said flap portion.

References Cited by the Examiner UNITED STATES PATENTS 619,653 2/99Asbury et al. 103119 746,482 12/03 Evans 103-119 1,050,905 1/13 Baade103-119 2,405,061 7/46 Shaw 103-126 2,611,320 9/52 Morrison 103--1192,780,070 2/57 Meade 103-419 KARL I. ALBRECHT, Primary Examiner.

LAURENCE V. EFNER, JOSEPH H. BRANSON, JR.,

Examiners.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No 3 207,079 September 21 1965 Ernest E. Cook et a1.

It is hereby certified that error appears in the above numbered patentrequiring correction and that the said Letters Patent should read ascorrected below.

Column 6, lines 23 to 28 strike out the list of references and insertthe following list:

619,653 2/99 Asbury et a1 -l03-1l9 746,482 12/03 Evans 103-l19 l 050,9051/13 Baade -103-1l9 1 980,986 11/34 Deming -l03-87 2,405 ,061 7/46 Shaw-103-126 2 ,611 ,320 9/52 Morrison --l031l9 2 739, 539 3/56 Gardiner-103-l36 2, 765,745 10/56 Sadler -103-136 2 ,780 070 2/57 Meade--l03-119 2 ,884 ,865 5/59 Pettibone -103-136 2 ,967 ,488 1/61 Gardiner-l03136 3 057,304 10/62 Rhode -l03136 Signed and sealed this 26th day ofApril 1966.

(SEAL) Attest:

ERNEST W. SWIDER EDWARD J. BRENNER Attesting Officer. Commissioner ofPatents

